#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>

int main()
{
  printf("I am running...\n");
  pid_t id = fork();
  if(id == 0)
  {
    int count = 5;
    while(count)
    {
    printf("I am child...PID:%d, PPID:%d, count:%d\n", getpid(), getppid(), count);
    sleep(1);
    --count;
    }
    printf("child quit...\n");
    exit(1);
  }
  else  if(id > 0)
  {
    while(1)
    {
      printf("I am father...PID:%d, PPID:%d\n", getpid(), getppid());
      sleep(1);
    }
  }
  else
  {
    printf("错误\n");
  }
  return 0;
}


